QTR-Quadtone RIP

I'm printing on an Epson 4000 with Epson UC inks using QTR on a variety 
of papers and am getting bronzing on all non-matte stock.  Epson 
Premium Luster is the worst with Epson Premium Glossy a bit better and 
Hahnemuhle Fine Art Pearl showing the least amount of bronzing.  I've 
tried spraying prints on all these papers with Hahnemuhle Protective 
Spray and Premier Printshield and the bronzing is reduced about by half 
and with Fine Art Pearl is reduced almost to zero.  Does anyone know of 
a spray that will eliminate bronzing on non-matte papers printed with 
Epson UC inks?

BTW, the Hahnemuhle and Premier sprays are the same product except for 
the labels.  Same can, same can code, same effect on prints, same smell.